1 files changed, 10 insertions, 0 deletions

diff --git a/src/mailman/interfaces/rest.py b/src/mailman/interfaces/rest.py
index 83a458c1d..4fbb0f5ef 100644
--- a/src/mailman/interfaces/rest.py
+++ b/src/mailman/interfaces/rest.py
@@ -21,12 +21,22 @@ from __future__ import absolute_import, unicode_literals
 
 __metaclass__ = type
 __all__ = [
+    'APIValueError',
     'IResolvePathNames',
     ]
 
 
+from lazr.restful.declarations import error_status
 from zope.interface import Interface
 
+from mailman.core.errors import MailmanError
+
+
+
+@error_status(400)
+class APIValueError(MailmanError, ValueError):
+    """A `ValueError` from the REST API."""
+
 
 
 class IResolvePathNames(Interface):